School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK.
Department of Materials, Loughborough University, Loughborough, LE11 3TU, UK.
Mater Horiz. 2021 Aug 31;8(9):2513-2519. doi: 10.1039/d1mh00908g.
With the emergence of stretchable/wearable devices, functions, such as sensing, energy storage/harvesting, and electrical conduction, should ideally be carried out by a single material, while retaining its ability to withstand large elastic deformations, to create compact, functionally-integrated and autonomous systems. A new class of trimodal, stretchable yarn-based transducer formed by coating commercially available Lycra® yarns with PEDOT:PSS is presented. The material developed can sense strain (first mode), and temperature (second mode) and can power itself thermoelectrically (third mode), eliminating the need for an external power-supply. The yarns were extensively characterized and obtained an ultrahigh (gauge factor ∼3.6 × 10, at 10-20% strain) and tunable (up to about 2 orders of magnitude) strain sensitivity together with a very high strain-at-break point (up to ∼1000%). These PEDOT:PSS-Lycra yarns also exhibited stable thermoelectric behavior (Seebeck coefficient of 15 μV K), which was exploited both for temperature sensing and self-powering (∼0.5 μW, for a 10-couple module at Δ ∼ 95 K). The produced material has potential to be interfaced with microcontroller-based systems to create internet-enabled, internet-of-things type devices in a variety of form factors.
随着可拉伸/可穿戴设备的出现，功能，如感测、能量存储/收集和电传导，理想情况下应由单一材料来执行，同时保持其承受大弹性变形的能力，以创建紧凑、功能集成和自主系统。本文介绍了一种由商业上可获得的莱卡纱线（Lycra® yarns）涂覆 PEDOT:PSS 形成的新型三模态、可拉伸纱线基换能器。所开发的材料可以感测应变（第一模式）和温度（第二模式），并且可以通过热电器件自行供电（第三模式），从而无需外部电源。对纱线进行了广泛的表征，获得了超高的（应变系数约为 3.6×10，在 10-20%应变范围内）和可调的（高达约 2 个数量级）应变灵敏度，以及非常高的断裂应变点（高达约 1000%）。这些 PEDOT:PSS-莱卡纱线还表现出稳定的热电行为（Seebeck 系数为 15 μV K），可用于温度感测和自供电（在 Δ ∼ 95 K 时，对于 10 对模块，约为 0.5 μW）。所生产的材料有可能与基于微控制器的系统接口，以在各种形式因素下创建具有互联网功能的物联网类型设备。
